How can you find this coin dealers? First, you need to find Wisma Merdeka. Wisma Merdeka is at jalan Tun Razak. You can find Hyatt Regency Kinabalu Hotel and Capital Hotel near Wisma Merdeka. If you're coming from Likas using Tun Fuad Stephen street, you can see the building at your right, beside Kinabalu college. In Wisma Merdeka, you need to look for Familia Store (at the end of the building, on first and second floor). You need to go up on second floor and look for Total stationery shop. All the coin dealer shops are around that stationery shop.
Owner: Charlie Chau
Thanks to Mr. Danny for the help.
If any of you knew any other place in Sabah where we can find a coin dealers, please share here. I found some small antique shops in Kota Kinabalu before but they're not focusing on banknote and coins like what you can find at this shops in Wisma Merdeka. The small shops price are higher then Market price and not worth sharing about them here.